S
M
T
W
T
F
S
26
83°
57°
27
83°
58°
28
84°
58°
29
83°
59°
30
82°
59°
31
83°
60°
1
82°
60°
2
82°
59°
3
83°
58°
4
82°
57°
5
82°
58°
6
83°
59°
7
83°
59°
8
84°
58°
9
82°
58°
10
82°
59°
11
83°
57°
12
84°
57°
13
84°
58°
14
83°
58°
15
83°
58°
16
84°
58°
17
84°
58°
18
83°
57°
19
84°
56°
20
83°
56°
21
87°
60°
22
84°
58°
23
84°
58°
24
85°
59°
25
84°
57°
26
84°
57°
27
85°
58°
28
84°
57°
29
84°
57°
30
85°
58°
31
84°
58°
1
85°
59°
2
85°
60°
3
86°
59°
4
85°
58°
5
86°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Unión de San Antonio
Unión de San Antonio's August 2026 forecast shows daily high temperatures ranging from 82° to 87°, with overnight lows between 56° and 60°. The average high for August is 84° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Unión de San Antonio. See also: September | October | November.
